COCO Dataset. The COCO dataset [1]} contains over 250, 000 person instances labeled and 200,000 images with 17 keypoints annotations. COCO dataset is divided into three sets named train, val and test-dev, containing 57k, 5k and 20k images respectively. In this paper, we used train2017 as an additional 2D human keypoint dataset. Accordingly, we set the loss value of depth becomes zero followed previous work [2]} when COCO dataset was imported.
